Cops are on the lookout for a man who they say used a knife to rob a RadioShack employee in East Tremont.

According to witnesses, the suspect attacked the female worker as she left the store on Belmont and East Tremont avenues at around 9:30 a.m. Another employee says the victim was carrying $3,700 and was on her way to make a deposit.

The man was caught on surveillance video from a camera two storefronts away and was dressed in a blue hoodie.

The woman is not believed to have suffered any injuries.

Police say the suspect took off with the cash and got away in an SUV.